I created a Question Multiple Short Text.
I used the answering options with IF, ({if(DMUkwaliteit_SQ001==1,DMUnaam_SQ001_SQ001,'')}
I need this question for filtering on quality==1, so I use this question for further use

I works fine, as long as the question is NOT hidden.
If I hide the question, all answers are prefilled.

Thus, the outcome differs solely on the fact whether the question is hidden or not.

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How do you hide the question? With the "hide always" option on the advanced settings? if you use that, it is as if the question would have never been created. You need to hide the question via CSS or Javascript, so that it is there in the source code, but doesn't show to the respondent.